> [hatchet job](http://i.word.com/idictionary/hatchet%20job)

is a written attack, often but not exclusively ad hominem, that emphasizes the poor quality of the object of the attack.

> [obloquy](http://i.word.com/idictionary/obloquy)

is a fancy word for the same.

> [calumny](http://i.word.com/idictionary/calumny)

is the same with the expectation of falsehood. They all have the same notion of strong bias by the author that hagiography does.